The NOSTRA code verification with using transients initiated by VVER control rod movement

The comparison is presented of the data on transients obtained in the critical test facility of RRC Kurchatov Institute and during the startup of VVER-1000 power units with the results of NOSTRA dynamical calculations. For the critical test facility and power units were the experiments carried out with the movement of an individual control rod, a group of control rods and scram rods. The results for experimental values of reactivity are compared with the dynamical calculations and calculations using the quasicritical methods. A good agreement between the results obtained in the calculations and in experiments is found, which demonstrates the possibility of using the NOSTRA code for calculations of transients in the VVER-1000 operation. (author)